lec10a - Sheet Sheet Metal Forming Deep Deep Drawing...

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Sheet Metal Forming Deep Sheet Metal Forming Sheet Metal Forming – Deep Deep Drawing Lecture 10.a ISE 2204 – Introduction to Manufacturing Processes Dr. Jaime Camelio March 26 th , 2009 Deep Drawing Forming Limit and Punch Forces Forming Limit Diagrams Deep Drawing Failures ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Outline
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ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Deep Drawing Low carbon steel and aluminum are the most common metal used for sheet metal product because of their formability and strength. x y z Flange 01 and are the blank and cup radii, is the cup height, and is the thickness. Rr ht d R 0 r 1 r h t x y z Wall ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Schematic of a Cup Drawing Operation
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T Flange Region 1: The flange where most deformation occurs. Wall Region 2: The wall which must support a sufficient force to cause the deformation. ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Simplified Analysis If the blank diameter is too large, force transmitted by the wall will be excessive, thereby causing it to fail. There exists a maximum blank to cup diameter ratio that may be drawn successfully. This is the limiting drawing ratio (LDR). Properties of the sheet metal Ratio of the blank diameter to the punch diameter Sheet thickness Clearance between punch and die Corner radii of the punch and die Blankholder force Speed of the punch Friction at the punch, die, and workpiece interfaces ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Important Variables in Deep Drawing
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There is a limit to the amount of material which can be drawn in. When the drawing stress at the inner radius becomes equal to the flow stress, the limit is reached.
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lec10a - Sheet Sheet Metal Forming Deep Deep Drawing...

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